You step out of the shower feeling perfectly clean, maybe even a little virtuous about your self-care routine. You reach for the towel hanging on the back of the door, press it against your face and think nothing of it. But when was the last time that towel saw the inside of a washing machine? If you have to pause and think, the answer is probably too long ago. And according to at least one dermatologist, what is quietly growing in those damp fibers is far more unsettling than you might expect.

What is actually living on your towel

We tend to think of towels as clean by association – after all, we only use them right after washing ourselves. But germs, spores and particles of all sorts live on every surface we touch. A 2023 case study demonstrated that even towels considered clean can harbor microorganisms. The moment you rub yourself dry, you transfer a cocktail of organisms from your own body onto the fabric, along with moisture, dead skin cells and other organic debris.

Those deposits are not just sitting there passively. They provide exactly the conditions microbes need to grow, multiply and adapt to their textile environment. A 2023 article published in Scientific Reports found that the microbial community that forms on towels is actually unique – distinct from the ones that develop on clothing or bed linens. So no, your bath towel is not comparable to your pillowcase. It is its own little ecosystem.

Here is where it gets genuinely unpleasant. When you dry off your lower body, microscopic fecal particles and various bodily fluids transfer to the fabric too. Reusing that towel means you risk exposing yourself to infectious diseases including pink eye (conjunctivitis), medication-resistant staph known as MRSA, norovirus and E. coli.

The minimum washing rule and why it matters

Dermatologist Alok Vij, MD, puts it plainly: as a general rule, you should launder your bath towel – or swap in a fresh one – at least once a week. The same frequency applies to hand towels. Washcloths and gym towels need to be laundered even more often because of the intensity and nature of their contact with your skin.

Neglecting that schedule can have real consequences for your skin. According to Dr. Vij, dirty towels can cause or spread fungal infections such as athlete’s foot, ringworm and jock itch, as well as viral infections like warts. They can also trigger flare-ups of eczema or atopic dermatitis, a chronic inflammatory skin condition. In an ideal world without water bills and packed schedules, a fresh towel every single day would be the gold standard. Since that is not realistic for most of us, weekly laundering is the practical baseline.

If the humidity in your home tends to run high, however, you need to step it up. Moisture-heavy air slows drying time, which means bacteria have a longer window to thrive. In that case, Dr. Vij recommends washing towels two to three times per week.

Smart habits that keep germs in check

How you hang your towel matters more than you might think. Draping it spread out over a towel bar allows it to dry thoroughly between uses, while bunching it on a hook traps moisture and creates the damp conditions germs love. This one small change can meaningfully slow microbial growth between washes.

Fabric choice plays a role, too. Plush, high-thread-count towels feel luxurious against the skin, but they take considerably longer to dry. Dr. Vij notes that microfiber towels dry faster than cotton, making them a smarter pick for gym use. Today there are more quick-dry towel options on the market than ever before, crafted from an ever-widening array of textiles, so it is worth exploring what suits your routine best.

Children deserve special attention here. Kids typically have poorer hand hygiene and are more prone to cuts, scrapes and skin conditions, all of which increase infection risk. Giving them their own dedicated towels is a simple precaution. The same heightened frequency applies if you are sick or have any injury or condition that compromises your skin barrier – think cuts, surgical incisions, rashes, sores or abscesses. In those situations, washing towels more often helps prevent reinfection.

And if a towel stays perpetually musty no matter how many times it goes through the wash, it is time to retire it. Repurpose it for messy tasks like drying your puppy’s paws after a muddy walk, or simply let it go.

The takeaway you will actually remember

Your towel is a core part of your daily hygiene routine, but it can quietly work against you when neglected. The essential rule is straightforward: launder bath and hand towels at least once a week, more frequently in humid environments or when your skin barrier is compromised, and even more often for washcloths and gym towels. Keep your towels drying flat on a bar, stay mindful about who shares them and when, and sanitize your washing machine periodically. A little attention to what hangs in your bathroom can keep the rest of your self-care routine from being undone before you even get dressed.